[yequalsx]

If it’s done right then I would expect Face ID to be as fast, fewer false positives, fewer fails. I don’t know if Apple has accomplished these goals but if they did then I'd consider their implementation innovative and would not assume it was done due merely to an inability to integrate Touch ID into the display.

[aetherson]

It's impossible to be as fast as "already unlocked by the time you see the screen." It could perhaps be "only imperceptibly slower," but it can't be as fast.

This review suggests that it's not "only imperceptibly slower," with its talk of the De Niro look.

[yequalsx]

For me Touch ID has been only slightly better than using a code for unlocking the phone. It can be as fast as Touch ID in the sense that by the time you can physically get the phone in position to do something it’s unlocked. You can’t unlock it when it’s in your pocket like you can with Touch ID but with Touch ID you still have to look at the phone to verify whether or not it has been unlocked. And most things you do with the phone require looking at it.